Errol Posted August 4, 2017 Share Posted August 4, 2017 I tried to calculate the FOV for both my dslr and guide-camera as listed above. However, the results I get using CCDCalc show a larger FOV for my dslr than guide-cam, which seems counterintuitive. what am I doing wrong? Image Train - Canon 1100D on Skywatcher ED80 (Note that I am not using a focal reducer at the moment) Guide Train - Philips SPC900NC on Skywatcher ST80 Link to comment Share on other sites More sharing options...
Davey-T Posted August 4, 2017 Share Posted August 4, 2017 This is what the FLO Astronomy Tools FOV calculator gives. You've got ST80 in one and ED80 on tother. Dave Link to comment Share on other sites More sharing options...
michaelmorris Posted August 4, 2017 Share Posted August 4, 2017 HI Errol I'm not sure you are doing anything wrong. The DSLR has a much larger chip, so I would expect it to have a larger field of view. Best thing would be use the FLO Astronomy Tool 'Field of View' calculator. http://astronomy.tools/calculators/field_of_view/ Link to comment Share on other sites More sharing options...
Merlin66 Posted August 4, 2017 Share Posted August 4, 2017 Yes, the DSLR chip size on the ED80 in fact gives you a wider field than the ST80/ webcam....... Link to comment Share on other sites More sharing options...
Errol Posted August 4, 2017 Author Share Posted August 4, 2017 Thanks all, will give FLO calculator a try. What are your thought on my pixel size and array size anyone. Do they look about right? Link to comment Share on other sites More sharing options...
Errol Posted August 4, 2017 Author Share Posted August 4, 2017 1 hour ago, Davey-T said: This is what the FLO Astronomy Tools FOV calculator gives. You've got ST80 in one and ED80 on tother. Dave Thanks Dave, and this is mine. So they are roughly the same, except perhaps for the array size. Link to comment Share on other sites More sharing options...
michaelmorris Posted August 4, 2017 Share Posted August 4, 2017 The 80ED and 1100D is the combination I was using until very recently. It worked well for me. Link to comment Share on other sites More sharing options...
Errol Posted August 4, 2017 Author Share Posted August 4, 2017 3 hours ago, michaelmorris said: HI Errol I'm not sure you are doing anything wrong. The DSLR has a much larger chip, so I would expect it to have a larger field of view. Best thing would be use the FLO Astronomy Tool 'Field of View' calculator. http://astronomy.tools/calculators/field_of_view/ Thanks for the link Michael that's a handy calculator. If I had known about it yesterday it would have saved me a lot of trouble trawling for data on the chips in the Canon and SPC900. Cheers Errol Link to comment Share on other sites More sharing options...
Errol Posted August 4, 2017 Author Share Posted August 4, 2017 Wow!, I can't wait to get started to be honest Michael, especially if I can even get close to results like that! Link to comment Share on other sites More sharing options...
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